US9084210B2 - User terminal and communication control method - Google Patents

User terminal and communication control method Download PDF

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US9084210B2
US9084210B2 US13/058,371 US200913058371A US9084210B2 US 9084210 B2 US9084210 B2 US 9084210B2 US 200913058371 A US200913058371 A US 200913058371A US 9084210 B2 US9084210 B2 US 9084210B2
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random access
access preamble
prach
resource blocks
mpr
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US20110188427A1 (en
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Hiroyuki Ishii
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NTT Docomo Inc
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NTT Docomo Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • the present invention relates to the technical field of mobile communications, and more particularly, to a user terminal and communication control method in mobile communication systems using the next-generation mobile communication technique.
  • the communication system that is a successor to the Wideband Code Division Multiple Access (WCDMA) system and High Speed Uplink Packet Access (HSUPA) system i.e. the Long Term Evolution (LTE) system has been studied by 3GPP that is the standardization group of WCDMA, and the specification development work has proceeded.
  • WCDMA Wideband Code Division Multiple Access
  • HSUPA High Speed Uplink Packet Access
  • LTE Long Term Evolution
  • OFDMA Orthogonal Frequency Division Multiplexing Access
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • the OFDMA system is a multicarrier transmission system for dividing a frequency band into a plurality of narrow frequency bands (subcarriers), and assigning data to each frequency band to perform transmission.
  • High-speed transmission is actualized by densely arranging subcarriers in the frequency domain to be orthogonal to one another, and it is expected to enhance spectral efficiency.
  • the SC-FDMA system is a single-carrier transmission system for dividing the frequency band for each terminal, and performing transmission using different frequency bands among a plurality of terminal.
  • the system is capable of reducing interference among the terminals with ease and efficiency, and further decreasing variations in the transmission power, and therefore, is preferable from the viewpoints of power consumption in the terminal, increases in coverage and the like.
  • one or more resource blocks are assigned to a mobile terminal to perform communications.
  • a base station apparatus determines a mobile terminal, to which it assigns resource blocks, from among a plurality of mobile terminals for each sub-frame (1 ms in LTE) (this process is called scheduling.)
  • the base station apparatus transmits a shared channel to the mobile terminal selected in scheduling in one or more resource blocks.
  • the selected mobile terminal transmits a shared channel to the base station apparatus in one or more resource block.
  • the shared channel is the PUSCH in uplink, while being the PDSCH in downlink.
  • the channel for random access is referred to as the Physical Random Access channel (PRACH).
  • PRACH Physical Random Access channel
  • the mobile terminal transmits a random access preamble on the Physical Random Access Channel.
  • the details of the Physical Random Access Channel and the random access preamble are defined, for example, in Non-patent literature 1.
  • used frequency bands are divided to prevent mutual interference.
  • a plurality of systems exits in the frequency band assigned to the system of cellular telephone, and the frequency band of each system is divided.
  • the mobile terminal needs to be equipped with a power amplifier with high linearity. Accordingly, in the case of considering the cost and size of the mobile terminal, there are cases that it is difficult to reduce the above-mentioned unwanted emissions, or meet the specification of adjacent channel interference and the specification of spurious emission as described above. In this case, for example, in Non-patent literature 2 as described above, to suppress the cost and size of the mobile terminal, it is specified to reduce the maximum transmission power on some condition. The reduction in the maximum transmission power is referred to as Maximum power reduction (MPR).
  • MPR Maximum power reduction
  • the MPR is defined based on the modulation scheme, system bandwidth and the number of resource blocks (Non-patent literature 2, Table 6.2.3-1).
  • the above-mentioned MPR is applied to the physical uplink shared channel PUSCH, but is not applied to the uplink random access channel PRACH or the random access preamble transmitted on the PRACH. Also in the random access preamble on the PRACH, the above-mentioned problem associated with the unwanted emissions to outside the system band exists, and it is necessary to apply the above-mentioned MPR.
  • the MPR is applied as few as possible.
  • a user terminal that performs radio communications with a base station apparatus in a mobile communication system.
  • the user terminal is provided with a parameter acquiring section configured to acquire a parameter from the base station apparatus, and a preamble transmitting section configured to transmit a random access preamble to the base station apparatus.
  • the preamble transmitting section reduces the maximum value of transmission power of the random access preamble to be lower than rated power defined in the mobile communication system based on the parameter.
  • the invention it is possible to provide a user terminal and communication control method in a mobile communication system for enabling reductions in the uplink cell radius to be avoided, while reducing complexity of a power amplifier in the mobile terminal, by applying the MPR to the random access preamble while reducing the MPR range to as small as possible.
  • FIG. 1 is a block diagram illustrating a configuration of a mobile communication system according to an Embodiment of the invention
  • FIG. 2 is a partial block diagram illustrating a base station apparatus in the mobile communication system according to an Embodiment of the invention
  • FIG. 3 is a partial block diagram illustrating a mobile terminal in the mobile communication system according to an Embodiment of the invention.
  • FIG. 4 is a diagram illustrating an effect by a method of determining maximum transmission power of a random access preamble according to the invention
  • FIG. 5 is another diagram illustrating the effect by the method of determining maximum transmission power of a random access preamble according to the invention.
  • FIG. 6 is a flowchart illustrating a communication control method in the mobile terminal according to an Embodiment of the invention.
  • a mobile communication system 1000 is a system to which Evolved UTRA and UTRAN (alias: Long Term Evolution, or Super 3G) is applied, for example, and is provided with a base station apparatus (eNB: e Node B) 200 and a plurality of mobile terminal 100 ( 100 1 , 100 2 , 100 3 , . . . , 100 n , n is an integer where n>0) that communicates with the base station apparatus 200 .
  • the base station apparatus 200 is connected to an upper node, for example, access gateway apparatus 300 , and the access gateway apparatus 300 is connected to a core network 400 .
  • the mobile terminal 100 n communicates with the base station apparatus 200 in a cell 50 by Evolved UTRA and UTRAN.
  • the access gateway 300 may be also referred to as MME/SGW (Mobility Management Entity/Serving Gateway).
  • Each mobile terminal ( 100 1 , 100 2 , 100 3 , . . . , 100 n ) has the same configuration, function and state, and is described as the mobile terminal 100 n below unless otherwise specified.
  • the mobile terminal performs radio communications with the base station apparatus, and more generally, may be user equipment (UE) including a mobile terminal and a fixed terminal.
  • UE user equipment
  • OFDMA Orthogonal Frequency Division Multiplexing Access
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • OFDMA is a multicarrier transmission system for dividing a frequency band into a plurality of narrow frequency bands (subcarriers), and mapping data to each frequency band to perform transmission.
  • SC-FDMA is a single-carrier transmission system for dividing the frequency band for each terminal so that a plurality of terminals uses different frequency bands to perform transmission, and thereby enabling interference among the terminals to be reduced.
  • Described herein are communication channels in Evolved UTRA and UTRAN.
  • PDSCH Physical Downlink Shared Channel
  • Downlink L1/L2 control channel Physical Downlink Control Channel
  • User data i.e. normal data signals are transmitted on the Physical Downlink Shared Channel.
  • notified are the ID of a user that performs communications using the Physical Downlink Shared Channel and information of transport format of the user data i.e. Downlink Scheduling Information, and the ID of a user that performs communications using the Physical Uplink Shared Channel and information of transport format of the user data i.e. Uplink Scheduling Grant, etc.
  • broadcast channels are transmitted such as the Physical-Broadcast Channel (P-BCH), Dynamic Broadcast Channel (D-BDH) and so on.
  • the information transmitted on the P-BCH is Master Information Block (MIB), and the information transmitted on the D-BCH is System Information Block (SIB).
  • MIB Master Information Block
  • SIB System Information Block
  • the D-BCH is mapped to the PDSCH, and transmitted from the base station apparatus 200 to the mobile terminal 100 n.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • User data i.e. normal data signals are transmitted on the Physical Uplink Shared Channel.
  • acknowledgement information for the downlink shared channel, downlink radio quality information (CQI: Channel Quality Indicator), etc. is transmitted on the Physical Uplink Control Channel.
  • CQI Channel Quality Indicator
  • the Physical Random Access Channel (PRACH) is defined for initial connection and the like.
  • the mobile terminal 100 transmits a random access preamble on the PRACH.
  • PRACH Physical Random Access Channel
  • the base station apparatus 200 according to the Embodiment of the invention will be described with reference to FIG. 2 .
  • the base station apparatus 200 according to this Embodiment is provided with a transmission/reception antenna 202 , amplifying section 204 , transmission/reception section 206 , baseband signal processing section 208 , call proceeding section 210 and transmission path interface 212 .
  • the user data transmitted from the base station apparatus 200 to the mobile terminal 100 in downlink is input to the baseband signal processing section 208 via the transmission path interface 212 from an upper node for the base station apparatus 200 , for example, access gateway apparatus 300 .
  • the baseband signal processing section 208 performs PDCP layer processing, segmentation and concatenation of user data, RLC (Radio Link Control) layer transmission processing such as transmission processing of RLC retransmission control, MAC (Medium Access Control) retransmission control e.g. transmission processing of HARQ (Hybrid Automatic Repeat request), scheduling, transmission format selection, channel coding, and Inverse Fast Fourier Transform (IFFT) processing on the data to transfer to the transmission/reception section 206 . Further, the signal of the Physical Downlink Control Channel that is the downlink control channel undergoes the transmission processing such as channel coding and Inverse Fast Fourier Transform, and transferred to the transmission/reception section 206 .
  • RLC Radio Link Control
  • MAC Medium Access Control
  • HARQ Hybrid Automatic Repeat request
  • HARQ Hybrid Automatic Repeat request
  • IFFT Inverse Fast Fourier Transform
  • the baseband signal processing section 208 notifies the mobile terminal 100 of the control information for communications in the cell on the above-mentioned broadcast channel.
  • the control information for communications in the cell includes the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, etc.
  • the base station apparatus 200 notifies the mobile terminal 100 of the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, etc. as part of the broadcast information.
  • the number of resource blocks (the number of RBs) of the PUCCH may be also referred to as a PUCCH resource size.
  • the base station apparatus 200 may notify the mobile terminal 200 of the information indicative of a position of the PRACH in the frequency domain i.e. position of resource blocks for the PRACH as part of the broadcast information.
  • the information indicative of a position of resource blocks for the PRACH may be also referred to as Prach Freq Offset or Prach Frequency Offset. For example, when the value of Prach Frequency Off set is “4”, since the number of resource blocks for the PRACH is “6”, it is possible to identify resource blocks of resource block numbers 4 to 9 as the resource blocks for the PRACH.
  • the transmission/reception section 206 performs frequency conversion processing for converting the baseband signal output from the baseband signal processing section 208 into a radio frequency signal, and then, the radio frequency signal is amplified by the amplifying section 204 , and is transmitted from the transmission/reception antenna 202 .
  • a radio frequency signal received in the transmission/reception antenna 202 is amplified in the amplifying section 204 , undergoes frequency conversion in the transmission/reception section 206 , thereby is converted into a baseband signal, and is input to the baseband signal processing section 208 .
  • the baseband signal processing section 208 performs FFT processing, IDFT processing, error correction decoding, reception processing of MAC retransmission processing, and reception processing of RLC layer and PDCP layer on the user data included in the input baseband signal, and the signal is transferred to the access gateway apparatus 300 via the transmission path interface 212 .
  • a random access preamble transmitted from the mobile terminal 100 is received, and then, undergoes the processing of random access procedures specified in Non-patent literature 3.
  • the call proceeding section 210 performs call proceeding such as setting and release of communication channels, status management of the base station apparatus 200 and management of radio resources.
  • the mobile terminal 100 according to the Embodiment of the invention will be described with reference to FIG. 3 .
  • the mobile terminal 100 is provided with a transmission/reception antenna 102 , amplifying section 104 , transmission/reception section 106 , baseband signal processing section 108 , application section 110 , random access preamble maximum transmission power setting section 112 , and random access preamble signal generating section 114 .
  • the amplifying section 104 amplifies a radio frequency signal received in the transmission/reception antenna 102
  • the transmission/reception section 106 converts the radio frequency signal into a baseband signal.
  • the baseband signal processing section 108 performs reception processing such as FFT processing, error correction decoding and retransmission control on the baseband signal.
  • the downlink user data is transferred to the application section 110 .
  • the application section 110 performs the processing of predetermined layer higher than the physical layer and MAC layer. Further, among the above-mentioned uplink data, the broadcast information is also transferred to the application section 110 .
  • the broadcast information includes the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, information indicative of a position of resource blocks for the PRACH, etc.
  • the application section 110 notifies the random access preamble maximum transmission power setting section 112 of the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, information indicative of a position of resource blocks for the PRACH, etc. included in the broadcast information.
  • the uplink user data is input from the application section 110 to the baseband signal processing section 108 .
  • the baseband signal processing section 108 performs the transmission processing of Hybrid Automatic Repeat reQuest (H-ARQ (Hybrid ARQ)), channel coding, DFT processing, IFFT processing and the like on the user data to transfer to the transmission/reception section 106 .
  • the transmission/reception section 106 performs frequency conversion processing for converting the baseband signal, which is output from the baseband signal processing section 108 , into a radio frequency signal, and then, the radio frequency signal is amplified by the amplifying section 104 , and is transmitted from the transmission/reception antenna 102 .
  • the random access preamble maximum transmission power setting section 112 receives, from the application section 110 , the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, information indicative of a position of resource blocks for the PRACH, etc. included in the broadcast information.
  • the random access preamble maximum transmission power setting section 112 is configured to determine the maximum transmission power of a random access preamble based on the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, information indicative of a position of resource blocks for the PRACH, etc.
  • the maximum power of a random access preamble may be expressed as the maximum transmission power of the PRACH.
  • the random access preamble maximum transmission power setting section 112 may determine the MPR for the random access preamble, and by the MPR for the random access preamble, determine the maximum transmission power of the random access preamble.
  • FIG. 4 shows the position relationship on the frequency domain between the transmission frequency band of the PRACH and the adjacent system, the system bandwidth is 5 MHz or 20 MHz.
  • the guard band having 250 KHz is defined.
  • the guard band having 1000 KHz is defined. In other words, this means that the frequency interval between the transmission frequency band of the PRACH and the adjacent system in frequency domain when the system bandwidth is 5 MHz is smaller than the frequency interval between the transmission frequency band of the PRACH and the adjacent system in frequency domain when the system bandwidth is 20 MHz.
  • the power level of unwanted emissions to outside the system band is decreased, as increases the frequency distance length between the frequency band of the PRACH and the system affected by the unwanted emissions i.e. the frequency interval between the transmission band of a transmission signal and the frequency band of the system affected by the unwanted emissions. Therefore, when the system bandwidth is 5 MHz, larger MPR is defined to decrease the power level of unwanted emissions to outside the system band, and it is thereby possible to reduce the effect by the unwanted emissions. Meanwhile, when the system bandwidth is 20 MHz, since the frequency distance length is large, the power level of unwanted emissions to outside the system band is low, and it is thereby possible not to apply the MPR or to decrease the value of MPR. As a result, it is possible to increase the maximum transmission power, and avoid reductions in the cell radius in uplink.
  • the identification information of the root sequence to generate a random access preamble signal on the PRACH is defined based on Cubic Metric as described in Non-patent literature 4.
  • the Cubic Metric is one of indexes indicative of the power level of unwanted emissions to outside the system band as described above. In other words, when the Cubic Metric is high, the power level of unwanted emissions is high, and when the Cubic Metric is low, the power level of unwanted emissions is low. Accordingly, as shown in FIG.
  • the MPR in the case of the identification information of the root sequence (0 to 455) with the low Cubic Metric, the MPR is set at 0 dB, and in the case of the identification information of the root sequence (456 to 837) with the high Cubic Metric, the MPR is determined based on the system bandwidth. By this means, it is possible to apply the MPR only in the case that the power level of unwanted emissions is actually high.
  • the MPR is determined based on the identification information of the root sequence and the system bandwidth, the MPR is applied to the random access preamble and the MPR range is reduced to as small as possible, therefore it is possible to reduce complexity of the power amplifier in the mobile terminal, and avoid reduction of the uplink cell radius.
  • the random access preamble maximum transmission power setting section 112 may determine the MPR for the random access preamble, and by the MPR for the random access preamble, determine the maximum transmission power of the random access preamble.
  • the maximum transmission power of a random access preamble may be determined based on the system bandwidth, in addition to the identification information of the root sequence to generate a random access preamble signal on the PRACH and the number of resource blocks (the number of RBs) of the PUCCH.
  • the reference table (1) of Table 2 may be defined for each system bandwidth to determine the MPR, and the maximum transmission power of a random access preamble may thereby be determined.
  • the reference table may be set for each system bandwidth.
  • the maximum transmission power of a random access preamble is determined based on the identification information of the root sequence to generate a random access preamble signal on the PRACH, the system bandwidth and the number of resource blocks (the number of RBs) of the PUCCH.
  • the maximum transmission power of a random access preamble may be determined based on the identification information of the root sequence to generate a random access preamble signal on the PRACH, and the number of resource blocks (the number of RBs) of the PUCCH.
  • FIG. 5 shows the position relationship on the frequency domain between the transmission frequency band of the PRACH and the adjacent system in frequency domain when the system bandwidth is 5 MHz and the number of resource blocks of the PUCCH is “4” or “6”.
  • the guard band of 250 KHz is defined as the guard band.
  • the transmission band of the PRACH is defined to be adjacent to the PUCCH.
  • the power level of unwanted emissions to outside the system band is decreased, as increases the frequency distance length between the frequency band of the PRACH and the system affected by the unwanted emissions i.e. the frequency interval between the transmission band of a transmission signal and the frequency band of the system affected by the unwanted emissions.
  • the number of resource blocks (the number of RBs) of the PUCCH is “4”
  • larger MPR is defined to decrease the power level of unwanted emissions to outside the system band, and it is thereby possible to reduce the effect by the unwanted emissions.
  • the number of resource blocks (the number of RBs) of the PUCCH is “6”
  • the identification information of the root sequence to generate a random access preamble signal on the PRACH is defined based on Cubic Metric as described in Non-patent literature 4.
  • the Cubic Metric is one of indexes indicative of the power level of unwanted emissions to outside the system band as described above. In other words, when the Cubic Metric is high, the power level of unwanted emissions is high, and when the Cubic Metric is low, the power level of unwanted emissions is low. Accordingly, as shown in FIG.
  • the MPR is set at 0 dB, and in the case of the identification information of the root sequence (456 to 837) with the high Cubic Metric, the MPR is determined based on the number of resource blocks (the number of RBs) of the PUCCH or the system bandwidth.
  • the MPR is determined based on the identification information of the root sequence and the number of resource blocks (the number of RBs) of the PUCCH, the MPR is applied to the random access preamble and the MPR range is reduced to as small as possible, therefore it is possible to reduce complexity of the power amplifier in the mobile terminal, and avoid reduction of the uplink cell radius.
  • the maximum transmission power of a random access preamble is determined based on the identification information of the root sequence, the system bandwidth and the number of resource blocks (the number of RBs) of the PUCCH, and as a matter of course, may be determined based on at least one of the identification information of the root sequence, the system bandwidth and the number of resource blocks (the number of RBs) of the PUCCH.
  • the position of the transmission frequency band of the PRACH or the random access preamble is determined using the number of resource blocks of the PUCCH and the system bandwidth.
  • the maximum transmission power of a random access preamble may be determined based on the identification information of the root sequence and the transmission frequency band of the PRACH or the random access preamble.
  • the maximum transmission power of the random access preamble may be determined based on the identification information of the root sequence and the information indicative of the position of resource blocks for the PRACH.
  • the random access preamble maximum transmission power setting section 112 notifies the random access preamble signal generating section 114 of the maximum transmission power of the random access preamble determined by the above-mentioned processing.
  • the random access preamble signal generating section 114 acquires the maximum transmission power of the random access preamble from the random access preamble maximum transmission power setting section 112 .
  • the random access preamble signal generating section 114 generates a signal of the random access preamble when the mobile terminal 100 performs random access procedures for initial connection, handover, data resuming, etc.
  • the details of the method of generating a random access preamble signal on the PRACH are described in 5.7.2 in Non-patent literature 1.
  • the section 114 may determine the power of the signal, for example, based on the path loss between the base station apparatus 200 and mobile terminal 100 , the preamble initial received target power notified from the base station apparatus 200 , and an offset value by power ramping.
  • the power ramping means that the transmission power of a random access preamble is increased in retransmitting the random access preamble, and an increase amount of the transmission power is determined by the offset value and the number of retransmissions.
  • n the number of retransmissions (assuming that the first transmission is “0” and that the second transmission (first retransmission) is “1”)
  • the random access preamble signal generating section 114 sets the transmission power of the signal of the random access preamble at the maximum transmission power of the random access preamble. In other words, the transmission power of the random access preamble is set at the maximum transmission power of the random access preamble or less.
  • the random access preamble signal generated in the random access preamble signal generating section 114 is output to the transmission/reception section 106 , and subjected to the frequency conversion processing in the transmission/reception section 106 , and then, the signal is amplified in the amplifying section 104 , and is transmitted from the transmission/reception antenna 102 .
  • the transmission power of the signal of the random access preamble is the above-mentioned value determined in the random access preamble signal generating section 114 .
  • FIG. 6 shows a communication control method in the mobile terminal 100 according to the Embodiment of the invention.
  • step S 602 the mobile terminal 100 acquires the system bandwidth, the number of resource blocks (the number of RBs) of the PUCCH and the identification number of the root sequence of the random access preamble.
  • the system bandwidth, the number of resource blocks (the number of RBs) of the PUCCH and the identification number of the root sequence of the random access preamble are included in the broadcast information notified from the base station apparatus 200 .
  • step S 604 the mobile terminal 100 determines whether the value of Cubic Metric of the root sequence determined by the identification information of the root sequence is high or not.
  • the flow proceeds to step S 606 , while proceeding to step s 610 when the value of Cubic Metric is low (step S 604 : No).
  • the determination whether the value of Cubic Metric is high or low may be made based on the identification information of the root sequence to generate a random access preamble signal on the PRACH. More specifically, the value of Cubic Metric may be determined to be low when the identification information of the root sequence ranges from 0 to 455, while being determined to be high when the identification information of the root sequence ranges from 456 to 837.
  • step S 606 it is determined whether the system bandwidth is more than 5 MHz. In the case that the system bandwidth is more than 5 MHz (step S 606 : Yes), the flow proceeds to step S 610 , while proceeding to step S 608 in the other cases (step S 606 : No)
  • step S 608 it is determined whether the number of resource blocks (the number of RBs) of the PUCCH is “6” or more. In the case that the number of resource blocks of the PUCCH is “6” or more (step S 608 : Yes), the flow proceeds to step S 612 , while proceeding to step S 614 in the other case (step S 608 : No).
  • the determination whether the flow proceeds to step 612 or S 614 may be made based on the information indicative of the position of resource blocks of the PRACH. More specifically, in the case that the position of resource blocks of the PRACH is assigned so as not to include at least one of six resource blocks at opposite ends inside the system band, the flow proceeds to step S 612 , while proceeding to step S 614 in the other case.
  • step S 610 the value of MPR is set at 0 dB.
  • step S 612 the value of MPR is set at 1 dB.
  • step S 614 the value of MPR is set at 2 dB.
  • transmission of the random access preamble is performed based on the maximum transmission power of the random access preamble. More specifically, the transmission power of the random access preamble is set not to exceed the maximum transmission power of the random access preamble, and the random access preamble is transmitted using the transmission power.
  • the value of MPR of the random access preamble is determined by comparing the system bandwidth with a predetermined threshold (5 MHz in FIG. 6 ), and as a substitute therefor, the value of MPR of the random access preamble may be determined based on the reference table as shown in Table 1.
  • the value of MPR of the random access preamble is determined by comparing the number of resource blocks of the PUCCH with a predetermined threshold (“6” in FIG. 6 ), and as a substitute therefor, the value of MPR of the random access preamble may be determined based on the reference table as shown in Table 2.
  • the value of MPR is determined based on the identification information of the root sequence, the system bandwidth, and the number of RBs of the PUCCH, and as a substitute therefor, the value of MPR may be determined based on part of the information on the identification information of the root sequence, the system bandwidth, and the number of RBs of the PUCCH.
  • the base station apparatus 200 notifies the mobile terminal 100 of the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, the identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, the information indicative of the position of resource blocks for the PRACH, etc. as part of the broadcast information, and as a substitute therefor, using RRC message, such information may be notified to the mobile terminal 100 from the base station apparatus 200 .
  • the number of resource blocks the number of RBs
  • the identification information of the root sequence Root Sequence Index
  • base station apparatus 200 may notify the mobile terminal 100 of the system bandwidth in uplink or downlink, the number of resource blocks (the number of RBs) of the PUCCH, the identification information of the root sequence (Root Sequence Index) to generate a random access preamble signal on the PRACH, the information indicative of the position of resource blocks for the PRACH, etc.
  • Embodiment of the invention it is possible to provide a user terminal and communication control method for enabling reductions in the uplink cell radius to reduced, while reducing complexity of a power amplifier in the mobile terminal, by applying the MPR to the random access preamble while reducing the MPR range to as small as possible.
  • Embodiment describes the examples in the system to which is applied Evolved UTRA and UTRAN (alias: Long Term Evolution or Super 3G), and the mobile terminal, base station apparatus, mobile communication system and communication control method according to the invention are applicable to other systems using the random access channel.
  • Evolved UTRA and UTRAN alias: Long Term Evolution or Super 3G
  • the above-mentioned operations of the mobile terminal UE and base station apparatus eNB may be implemented by hardware, software module executed by a processor, or combination thereof.
  • the software module may be provided in a storage medium of any form such as RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable ROM), register, hard disk, removable disk and CD-ROM.
  • RAM Random Access Memory
  • flash memory ROM (Read Only Memory)
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable and Programmable ROM
  • register hard disk, removable disk and CD-ROM.
  • the storage medium is connected to the processor to enable the processor to read and write the information from/in the storage medium. Further, the storage medium may be packed in the processor. Furthermore, the storage medium and the processor may be provided inside ASIC. The ASIC may be provided inside the mobile terminal UE and/or base station apparatus eNB. Moreover, the storage medium and the processor may be provided inside the mobile terminal UE and/or base station apparatus eNB as a discrete component.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
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CN102119561A (zh) 2011-07-06
EP2315479A1 (en) 2011-04-27
JPWO2010018820A1 (ja) 2012-01-26
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